Change/modify data in file?

How would I write a script that would replace all occurrences of the old name with the new name and saving this as a new file. To replace the string, I used strrep(), but I am not sure how to use it and to also to save changes onto a new file. What is wrong with my script?

Data file looks as so:

Vendor Customer

Acme XYZ

Tulip2you Flowers4me

Flowers4me Acme

XYZ Cartesian

My script is:

data1 = 'vendorcust.dat';

FID = fopen(data1,'w');

file = type(data1);

newdata = strrep(file, 'Acme','NewAcme');

[Jan]

Please explain, why you think, that something is wrong with the script. Do not let us guess, what you found out already.

Answer 1

[Jan]

type is not thought for importing the contents of a file, but it works. I do not see any trial to create a new file.

FileName = 'vendorcust.dat';    % "data1" is a bad name for the name of a file
Data     = fileread(FileName);  % Import the file's contents
Data     = strrep(Data, 'Acme', 'NewAcme');  % Apply the modification

FID = fopen('vendorcust_new.dat');  % Create a new file
if FID == -1, error('Cannot open file'); end  % Always check for success
fwrite(FID, Data, 'char');          % Write data
fclose(FID);                        % Closing is important

This is a little bit too much help for a homework question. Please consider, that submitting it without mentioning the sources is cheating. But I'm tired and it is harder to assist than to solve here. Sorry!

[Nora]

This does make sense. Thank you for taking the time to explain each part!